Watch cap



FIG. 1 is a top right perspective view of a watch cap showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is a front elevational view thereof. 

The ornamental design for a watch cap, as shown and described. 